Geodesic
Homentropic model of spherical shock wave reflection from the center of convergence
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 3, pp. 70-76.

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An implosive shock wave on a based gas the particular case of motion with zero pressure, but with variable density is discussed. The density is described by degree relation to distance up to a point of focusing of a shock wave. Such selection of an exponent in this relation that the entropy in all area of flow after passage of a shock wave was a constant (homentropic case) is offered. Thus qualitatively different behaviour of temperature in comparison with classical case Guderley–Landau–Stanjukovich is obtained. 
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I. A. Chernov. Homentropic model of spherical shock wave reflection from the center of convergence. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 3, pp. 70-76. http://geodesic.mathdoc.fr/item/ISU_2010_10_3_a9/

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